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Makes minor tidiness improvements to the TMS.

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This commit is contained in:
Thomas Harte 2017-12-08 22:20:21 -05:00
parent e1914b4f16
commit 7a544731e2
1 changed files with 12 additions and 11 deletions
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23
Components/9918/9918.cpp
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@ -87,13 +87,14 @@ void TMS9918::test_sprite(int sprite_number) {
return;
}
sprite_sets_[active_sprite_set_].active_sprites[active_sprite_slot].index = sprite_number;
sprite_sets_[active_sprite_set_].active_sprites[active_sprite_slot].row = sprite_row;
SpriteSet::ActiveSprite &sprite = sprite_sets_[active_sprite_set_].active_sprites[active_sprite_slot];
sprite.index = sprite_number;
sprite.row = sprite_row;
sprite_sets_[active_sprite_set_].active_sprite_slot++;
}
void TMS9918::get_sprite_contents(int field, int cycles_left, int screen_row) {
int sprite = field / 6;
int sprite_id = field / 6;
field %= 6;
while(true) {
@ -101,27 +102,27 @@ void TMS9918::get_sprite_contents(int field, int cycles_left, int screen_row) {
cycles_left -= cycles_in_sprite;
const int final_field = cycles_in_sprite + field;
assert(sprite < 4);
assert(sprite_id < 4);
SpriteSet::ActiveSprite &sprite = sprite_sets_[active_sprite_set_].active_sprites[sprite_id];
if(field < 4) {
std::memcpy(
&sprite_sets_[active_sprite_set_].active_sprites[sprite].info[field],
&ram_[sprite_attribute_table_address_ + (sprite_sets_[active_sprite_set_].active_sprites[sprite].index << 2) + field],
&sprite.info[field],
&ram_[sprite_attribute_table_address_ + (sprite.index << 2) + field],
static_cast<size_t>(std::min(4, final_field) - field));
}
field = std::min(4, final_field);
const int sprite_offset = sprite_sets_[active_sprite_set_].active_sprites[sprite].info[2] & ~(sprites_16x16_ ? 3 : 0);
const int sprite_address =
sprite_generator_table_address_ + (sprite_offset << 3) + sprite_sets_[active_sprite_set_].active_sprites[sprite].row;
const int sprite_offset = sprite.info[2] & ~(sprites_16x16_ ? 3 : 0);
const int sprite_address = sprite_generator_table_address_ + (sprite_offset << 3) + sprite.row;
while(field < final_field) {
sprite_sets_[active_sprite_set_].active_sprites[sprite].image[field - 4] = ram_[sprite_address + ((field - 4) << 4)];
sprite.image[field - 4] = ram_[sprite_address + ((field - 4) << 4)];
field++;
}
if(!cycles_left) return;
field = 0;
sprite++;
sprite_id++;
}
}